| Analysis on characteristics and influencing factors of soil nitrogen for terrace in the Weibei dryland |
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| DOI：10.7606/j.issn.1000-7601.2008.05.23 |
| Key Words: Weibei dryland terrace soil nitrogen characteristic influencing factor |
| Author Name | Affiliation | | BAO Yaoxian | College of Resources and Environmental Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China | | WU Faqi | College of Resources and Environmental Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China | | LIU Minghu | Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China | | SONG Fangyun | Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China |
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| Abstract: |
| Testing the content of organic matter(OM), total nitrogen(TN), available nitrogen(AN), mineral nitrogen(NH4+-N＋NO3--N) and other physical-chemical properties under different use years of terrace. Using statistical analytical method, the characteristic, variability in profile of soil nitrogen and its influencing factors for terrace were studied systematically in the Weibei dryland. The results showed that distributions of various soil nitrogen were uneven and their contents were poor except for TN, especially, the content of mineral nitrogen(MN) was very poor. The contents of various soil nitrogen in topsoil were highest and their contents decreased from upper to lower in vertical profile and their significant differences were found between topsoil and lower layers. Fertilization increased obviously the content of various soil nitrogen. OM, TN and AN were in fluenced obviously and positively by the contents of CEC, clay particle, total phosphorus(TP) and available phosphorus(AP). The contents of CaCO3 and silt particle made “dilution effect” of soil nitrogen. All soil nitrogen was effected to some extent by aspect and position of the slope and type of terrace. The content of OM, TN and AN increased incipiently and decreased subsequently with the increasing of terrace use years, the degraded critical year of them was 19 years at least in study area. |
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